Addons Not showing up in Toolbar (Blender 2.8 Alpha)
Blender 2.8 has yet to notify the add-on developers to make it compatible with 2.8. Currently, no or very few Add-ons work for this release. The release day for the beta version has been notified, check the website.

Link to the site : https://code.blender.org/2018/06/beyond-the-code-quest/